Robust Digital Watermarking Technique for Satellite Images

Abstract

To overcome the copyright-protection issue, digital watermarking techniques have received considerable attentions and have been under development for several years. Therefore, this paper proposed a new watermarking scheme based on Discrete Wavelet Transform (DWT) and Discrete Cosine Transform (DCT) for satellite images. This will improve both the robustness and imperceptibility requirements of the watermarking algorithm. Firstly, the original image is transformed using DWT prior to the DCT. Then, the gray-level watermark is embedded into the first five AC-DCT coefficients of the selected DWT bands. Simulation results show that the proposed technique has better imperceptibility and higher robustness against various image processing attacks.